/*
This file is part of La Linea.

La Linea is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

La Linea is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with La Linea.  If not, see <http://www.gnu.org/licenses/>.
*/

#include "Util.h"

int Util::next_p2 (int a){
	int rval=2;
	while(rval<a) rval<<=1;
	return rval;
}

void Util::pushScreenCoordinateMatrix() {
	glPushAttrib(GL_TRANSFORM_BIT);
	GLint   viewport[4];
	glGetIntegerv(GL_VIEWPORT, viewport);
	glMatrixMode(GL_PROJECTION);
	glPushMatrix();
	glLoadIdentity();
	gluOrtho2D(viewport[0],viewport[2],viewport[1],viewport[3]);
	glPopAttrib();
}

void Util::pop_projection_matrix() {
	glPushAttrib(GL_TRANSFORM_BIT);
	glMatrixMode(GL_PROJECTION);
	glPopMatrix();
	glPopAttrib();
}